Chuck.



PATENTED JAN. 23, 1906.

W. MASON.

CHUCK.

APPLIOATION FILED APB-.1, 1905.

3 SHEETS-SHEET 1.

Q v m v IJ V W u a w v QM.

PATENTED JAN. 23, 1906. W. MASON. CHUCK. Arrmonxon run!) 423. 1. 1905.

3 SHEETS-SHEET 2.

PATENTED JAN. 2a, 1906.

W. MASON.

annex. AIPLIOATION FILED APB. 1,1905.

3 SHEETS-SHEET 3.

I UNITED STATES PATENT OFFICE;

WILLIAM MASON, OF. NEW HAVEN, CONNECTICUT, ASSIGNOR TO WIN- CHESTER REPEATING ARMS CO.,

CORPORATION.

Specification of Letters Patent.

OF NEW HAVEN, CONNE(. Tl(. Ul, A

CHUCK.

I Patented Jan. 23, 1906.

Application filed April 1, 1905. Serial No. 253,321.

To 71,7] whom it may concern.-

- Be it known that I,W1LLIAM MASON, a'citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Im rovcd Chuck; and I-do hereby declare the follbwing, when taken in connection with the 'accom p anying drawings and the numerals direction of the arrow Fig. 3, a view correspondin to Fig. 1, but showing the chuck as G osed; Fig. 4, a view in vertical transverse section on the line e f of Fig. 3 looking in the direction of the arrow g; Fig. 5, a detached view, partly in side elevation and partly in longitudinal section, of the rotary spindle of my improved chuck; Fig. 6, a view of the inner end thereof; Fig. 7, a detached view,-

partly in side elevation and partly in section, of the sliding jaw-operating sleeve; Fig. 8, a corres onding View .of the lever-operating ring; ig. 9, a detached view of the removable center-carrying plug; Fig. 10, an end view of the said plug; Fig. 11, adetached view, in central longitu inal section, of the split sleeve, which is split to form the main jaws; Fig. 12, an end view thereof looking toward the free ends of the jaws; Fig. 13, a detached plan View of one of the supplemental jaws; Fig. 14, a view thereof in side elevation; Fig. 1.5, an end View thereof; Fig. 16, a detached View, in side elevation, of the spring; Fig. 17, a corresponding view of one of the levers employed to operate the sliding sleeve; Fig. 18, a corres onding view of the split work-gripping s eeve; Fig. 19, an end View thereof; Fig. 20, a

detached view of the operating-lever; Fig. 21, a broken view thereof in side elevation.

My invention relates to an improved chuck, the object being to produce a convenient and effective device constructed to center the 5.

work with respect to the center of the rotary spindle of the chuck irrespective of the exte- .rior form of the work.

With these ends in view my invention consists 1n a chuck having certain details of construction and combinations of parts, as will be more fully hereinafter described, and pointed out in the claims.

In carrying out my invention as herein shown I employ three manually operable supplemental chuck-jaws 2, having flat inner or gripping faces 3, which may, however, be otherwise shaped to conform to the conformation of the work, these jaws being manually operable'by direct or immediate engagement by the fingers by which they are tapped, so to speak, for moving them longitudinally inward. As shown, the jaws are given a tapered wedge-like form from their.

outer to their inner ends by beveling their outer faces 4 and are furnished upon their sides with longitudinal retaining ribs 5. Each jaw is also formed in its outer face with a shallow longitudinal groove 6. The number of the jaws will be varied according to the size and character of the chuck, which will also determine the details of their construction; but however constructed the said,

supplemental jawsare movably mounted for immediate manual operation in the main jaws of the chuck for being initially positioned independently thereof. As shown, they are mounted in longitudinal T-slots 7, formed in the outer ends of three main spring-jaws 8, produced in the ordinary manner by splitting a sleeve 9. Radial pins 10, mounted in the said yielding main jawsS, enter the grooves 6 in the supplemental jaws 2 and confine the same in place as well as limit their longitudinal movement, which is at a right angle to the movement of the main jaws'8, from the outer ends of which their outer ends project, so as to be conven ient of access to the fingers, by which they are directly or immediately operated. In this connection I may say that the respective supplemental jaws are operated by tapping whereas if they were operated mechanically-.

as, for instance, by screwsso much power would be imposed upon them that they might bend or distort'or displace the work if delicate in itself or delicatelcy centered. The said split slc'eve 9 is locate in a sliding jawoperating sleeve 11, the outer end of which has a flaring mouth 12, the inner face of which coacts directly with the beveled outer-{1 edges 13 of longitudinally-arranged shoul ders 14, located upon the outer faces of the jaws 8. A coiled spring 15, located within the slding sleeve 11 and interposed between the inner end of the split sleeve 9 and a shoulder 16, formed within the sleeve 11, exerts a constant efiort to hold the sleeve 9 at the limit of its outward movement, in which the forward ends v17 of the shoulders 14 are engaged with the inner face of a cap 18, internally threaded for being screwed upon the externally-threaded forward end 19 of the rotary spindle 20, which is journaled in the uprights 21 21 of the frame 22 and driven by means of a pulley 23, secured in place by a set-screw 24. 'Under this construction the sleeve 9 forms a point of purchase for the spring 15, which exerts a constant effort to ush the sleeve 11 inward, so as to clear the fiaring mouth 12 of the sleeve 11 from the beveled faces 13 of the shoulders 14 of the yielding main jaws 8 and permit the same to spring laterally apart by virtue of their resiliency.

, vers.

The inner end of the sliding sleeve 1 1 is engaged with the heels 25 of two or more operating-levers 26, (only one is shown,) hung on pins 27 in-longitudinal slots 28 in the rotary spindle 20 and extending rearward into a ring 29, sliding on the spindle 20 and having a beveled face 30 arranged to coact with the outwardly-turned free ends of the said le- The ring 29 is formed with a circum- 'ferential groove 31 for the reception of two button-like swiveling studs 32, mounted oposite each other in the arms of an operatingever 33, hung on a fixed stud 34 in a bracket 35 on the frame 22, one of the arms of the said lever 33 being extended to form a handle 36. When the jaws 8 are open, as shown in Fig. 1, the levers 26 have their free inner ends thrown radially outward by the action of the sliding sleeve 11 under the influence of the spring 15. To close the said jaws 8, the

handle 32 is moved from right to left, where-' by the bevel 30 of the ring 29 is engaged with the free ends of the levers 26 and the same forced inward into the longitudinal slots 29 in the spindle 20, causing the heels 7 25 of the levers 26 to push the sleeve 11 againstthe tension of the spring 15, so that its flaring mount 12 is moved over the-bevels 13 of the shoulders 14 of the main jaws 8,

which are thus forced radially inward toward each other, carrying with them the supple- I mental jaws 2, which arejthus caused to grip the work. I

Before the jaws 2; and the jaws 6 are brought into play the'workor piece, to be operated upon, whatever its character may be,

is first accurately centered with respectto the true axial center of the rotary spindle 20, this centering of the work being effected irrespective of its external contour and whether its surface is concentric or eccentric with its longitudinal center. For centering the work as described I provide a center in the form, as shown, of an ordinary centerin' pin or point 37, mounted so as to be radia 1y movable into and out of line with the true axial center of the rotary spindle 20. This center 37 may be mounted in any convenient way so long as provision is made for retiring it after the work has been centered and gripped by the jaws 2. If desired, the center 37 may be mounted, and probably will be mounted, in a tool-carrying head, such as a turret or OS cillating segment of well-known construction. Such devices are too well known in the art to need further description or illustration. I also employ a center adapted to be inserted into and removed from the inner end of the rotary spindle 20. As shown, this center-- consists of a pin 38, backed up and made yielding by a spring 39 and mounted in the reduced inner end 40 of a plug 41, adapted in diameter to fit sungly within the inner end of the spindle 20. A slot 42 in the pin 38 receives a sto pin 43, mounted in the reduced end 40 of t e plug and confining the pin in place. A stud 44, radially mounted in the plug 41, is provided for locking the plug in the s indle 20, which is provided with a bayonet-s 0t 45 for thereception of the pin. A rod 46 being passed transversely through the outer end of the plug provides a handle for the operation of the same.

A work-gripping sleeve 47, having its forward end split to form spring gripping-fingers 48, is adapted at its outer end to fit snugly over the reduced portion 40 of the plug 41 and formed with a pin-hole 48*, receiving the outer end of the stop-pin 43, whereby the said sleeve 47 and plug 41 are coupled together.

In the operation of the device as herein shown the plug 41 is removed from the spindle 20, after which the workis introduced thereinto through the inner end thereof, the outer end of the work being passed through the jaws 2 and 8 and engaged with the center 37 which is now stationed in line with the axial center of the spindle 20. After the work-has been engaged at one end, as de-.

scribed, with the cent-er 37 the plug 41 is again inserted into the inner end of the spind 'e 20, whereby its yieldin center 38 is engaged with the inner end 0 the work, which is thus temporarily supported b the centers 37 and 38, with its longitudina axis coincident with the true axis of the rotary spindle 20. The sup lemental' jaws 2 are now manually pushe Ion itudinally inward independent of each 0t er until their inner faces 3 are brought into contact with the work, whereby they are manually positioned. If the exterior of the work is accurately con scribed, whereby the sleeve '11 is slid from left to right and the jaws 8 forced radially inward, so as to crowd the jaws 2, carried by them, firmly upon the work, which is thus gripped. preparatory to the action upon it of the cuttingtools whatever character they may have. Although. the main jaws 8 are moved correspondingly inward by the action of the sleeve 11, the coincidence of the axis of the work with respect to the axis of the rotary spindle established by the centers 37 and 38 is not disturbed, for the reason that the supplemental jaws 2 have been differentially positioned to compensate for any departures of the surface of the work from concentricity with its true axis. The work having been gripped as described, the center 37 is retired, leaving the projecting outer end of the Work free to be acted upon by the cuttingtools. After the cutting tools have been brought into play the plug 41 is withdrawn from the spindle 20, bringing with it the work which is gripped by the work-gripping sleeve 4 7, which saves the trouble of pushing the work one way or the other out of the spindle.

It is apparent that in carrying out my invention some changes from the construction herein shown and described may be made. The number of the supplemental jaws may be varied and their specific construction changed, as already described. .If desired, also, the chuck may be constructed with reference to introducing the work into and withdrawing it from the outer end of the rotary spindle. may be employed totake the place of the user's fin ers for initially positioning the supplementa jaws. I would therefore have it understood that I do not limit myself to the exact construction herein shown and described, but hold myself at liberty to make v such departures therefrom as fairly fall with.-

in the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire tosecure by Let-- ters Patent, is'- 1. In a chuck, the combination with two movable centers, of a spindle, main jaws carried thereby, and supplemental jaws mounted in the main jaws and constructed and arranged to be independently moved by direct manual engagement into frictional contact with the work after the same hasbeen centered by the said centers with respect to the axis of Furthermore, if desired, means the spindle and prior to the operation of the main jaws for clamping the work.

2. In a chuck, the combination with two movable centers, of a spindle, main jaws carried thereby, and longitudinally -movable wedge shaped supplemental jaws mounted in the said main jaws and constructed and ar ranged to be independently moved by direct manual engagement into frictional contact with thework after the same has been cen-- tered by the said centers with respect to the aXis of the spindle and prior to the operation of the main jaws for clamping the work.

In a chuck, the combination with two movable centers, of a tubular spindle having one of the said centers located outside of but near its outer end, .and the other of the said centers located within and near its inner end, main jaws carried by the said spindle at its outer end, and supplemental jaws mounted in the main jaws and constructed and arranged to be independently moved by direct manual engagement into frictional contact with the work after the same has been centered by the said centers with respect to the axis of the spindle and prior to the operation of the main jaws for clamping the work.-

. 4. In a chuck, the combinationwitha spindle, of two movable centers respectively located substantially at the ends thereof, main jaws, and supplemental jaws mounted therein and constructed and arranged to be independently moved by direct manual engagement into frictional contact with the work after the same has been centered with respect to the axis of the spindle by the said centers and prior to the operation of the main jaws for clamping the work.

5. In a chuck, he combinationwitha spindle, of a sleeve located therein main jaws carried bythe sleeve, a sliding s eeve located in the spindle for forcing the main jaws toward each other, a removable center for insertion prior to the operation of the main jaws for clamping the work. 7

6. In a chuck, the combinationwith a spindle, of a sleeve split to form spring main jaws, a sliding sleeve for forcing the main jaws toward each other, the spindle containin the sleeves, a removable plug carrying a yie ding center for insertion into the lnner end of the spindle, a movable center located adjacent to t e jaws, and supplemental jaws mounted in the main jaws and constructed and arranged to be independently moved by direct manual &

engagement into frictional contact with the Work after the same has been centered with respect to the axis of the spindle and prior to the operation of the main the work.

7. In a chuck, the combination with a spindle, of a sleeve split to form spring main jaws a sliding sleeve for operating the said jaws, the spindle containing the sleeves, a removable plug carrying a center for insertion into aws for clamplng the lnner end of the spindle, means carried by the plug for gripping the work, a movable center located near the main jaws, and supplemental jaws mounted in the main jaws and constructed and arranged to be independently moved into frictional contact with the work after the same has been centered with a respect to the axis of the spindle and prior to "the operation of the main jaws for clamping WILLIAM MASON.

Witnesses: DANIEL H. VEADER.

-' J. DIGNAN. 

